Move environment role method into domain

atst/domain/environment_roles.py

@@ -0,0 +1,16 @@
+from atst.models.environment_role import EnvironmentRole
+from atst.database import db
+
+
+class EnvironmentRoles(object):
+    @classmethod
+    def get(cls, user_id, environment_id):
+        existing_env_role = (
+            db.session.query(EnvironmentRole)
+            .filter(
+                EnvironmentRole.user_id == user_id,
+                EnvironmentRole.environment_id == environment_id,
+            )
+            .one_or_none()
+        )
+        return existing_env_role